what I have is a homemade grill made out of stainless steel with two grills,one for bbq made out of 1 inch expanded metal,and my steak grill which is 3 inch expanded metal.The steak grill is THICK steal.
the trick to getting a nice char on the outside is to build the HOTTEST fire under the grill! When you throw the steak on it you should hear it sizzle! It is so hot I have to use tongs to put it on or the hair on my hands and arm will singe off. around 2 minutes per side should do it.
This is Important. When you take it off and put the steak on the platter Cover it with Foil! other wise it will dry out!